I would honestly suggest the aragonite black sand (sold at Petco, also go figure) it is white and black sand mixed and I think it looks really cool, it is not the tahitian moon sand, which is useless in a reef tank (IMHO) since you can't use sand sifting creatures and it doesn't support "live" sand type cultures very well (not saying it isn't possible), and yes, it looks nasty unless you clean and maintain it yourself very well.